when using uppercase and lowercase letters the Shift key will produce unexpected input

[incenargo]

Im using tile mode with upper-/lowercase letters and Numbers (label_symbols=1qQaAyY2wWsSxX3eEdDcC4rRfFvV5).

When i select a lowercase letter eg. (e) and then press shift to select an uppercase letter it will select ee. When i then press backspace to select e again i can select any uppercase letter, because shift wont produce the input.

This happens when theres 2 and 3 letters, but when there would be a field labeled aaa pressing a > shift will select (aa)a not (aaa).

Im not sure if its intended or not, but if it is it would be nice to have a way to adjust the behaviour of the shift key.

You should be able to answer the following questions:

• How to reproduce the bug?

1. use uppercase letters as label symbols (for tile mode at least)
2. run the program in tile mode
3. select lowercase letter
4. press shift

• What is going wrong?
  The shift key produces input depending on the lowercase letter selected (copies it i guess)
• What is the expected behaviour?
  The Shift key shouldnt produce input

It is helpful to provide screenshots and screencasts.

Then give the following information:
** wl-kbptr version
wl-kbptr 0.4.1 (opencv)
** compositor
niri 25.11 (v25.11-129-g734d86ec)
** OS
cachyos with Linux 6.19.8-arch1-1 kernel
** display
mode "1920x1200@59.999"
scale 1